Pension and Other Postretirement Benefits - Schedule of Weighted-average Assumptions Used to Determine Net Periodic Benefit Cost (Details)	12 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2023
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Discount rate	5.98%	5.89%	5.01%
Expected long-term rate of return on plan assets	6.50%	6.50%	6.25%
Long-term rate of compensation increase	3.32%	3.28%	3.28%
Other Benefits
Defined Benefit Plan Disclosure [Line Items]
Discount rate	6.07%	5.87%	5.02%
Expected long-term rate of return on plan assets	6.50%	6.50%	6.25%